White mold on indoor houseplant soil - Knowledgebase Question

Bear, De
Question by astrogrri5
March 13, 2010
Last week I started some seeds in small pots in my kitchen. I water them when the tops look dry, and I noticed the top of the soil is lightly covered in white mold. How can this be prevented?

Answer from NGA
March 13, 2010


Your seedlings are within a hair of developing damping off, a fungal disease. The mold is a sure sign that the air circulation is poor and humidity is high. You may be able to stop the fungal growth by training a fan on the seedlings. This will circulate the air and reduce the humidity, which should control the fungus. I use a small (6") fan that rotates back and forth to keep the air circulating around my seedlings. Hope this helps.

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